Python Popen().stdout.read() hang

Question

I\'m trying to get output of another script, using Python\'s subprocess.Popen like follows

process = Popen(command, stdout=PIPE, shell=True)
exitc         


        

Answer 1

read() waits for EOF before returning.

You can:

• wait for the subprocess to die, then read() will return.
• use readline() if your output is broken into lines (will still hang if no output lines).
• use os.read(F,N) which returns at most N bytes from F, but will still block if the pipe is empty (unless O_NONBLOCK is set on the fd).